*Ce(IO3)4
*RaSO4
*Pb(NO3)2
*(NH4)2SeO4
2 Answers

The solubility of 3 out of 4 of the substances are included at the link below in terms of g/ 100ml.

You have to know the densities of each one and use the equation D= (m/V) (density=mass/volume) and solve for mass. Use
m=DV